In ghc 6.2 and 6.3 (CVS as of early March) evaluating the following in
ghci gives an "impossible happened" error.
do {d <- runQ $ [| let foo = bar where bar = 3 in foo |]; print d}
The bit that causes the problem is the where in the declaration context
introduced by the let.
ghci-6.2 says:
ghc-6.2: panic! (the `impossible' happened, GHC version 6.2):
nameModule bar_d1yu
and ghci-6.3 says something similar
ghc-6.3: panic! (the `impossible' happened, GHC version 6.3):
nameModule bar{v} {- v aFI -}
Duncan
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